Abstract
The range of the barred owl (Strix varia) has expanded westward over the past century and now entirely overlaps the range of the federally threatened northern spotted owl (S. occidentalis caurina) in the Pacific Northwest. We compared Haemoproteus blood parasite assemblages among northern spotted owls in their native range and barred owls in both their native and invasive ranges to evaluate predictions of five hypotheses about parasites and biological invasions: (1) Enemy Release, where hosts benefit from a loss of parasites in their invasive range, (2) Enemy of My Enemy, where invasive hosts introduce parasites to naïve native hosts, (3) Parasite Spillback, where invasive hosts act as a new reservoir to native parasites, (4) Increased Susceptibility, where native hosts introduce parasites to naïve invasive hosts, and (5) Dilution Effect, where invasive species act as poor hosts to native parasites and decrease the density of potential hosts in their invasive range. We used haplotype network analyses to identify one haplotype common to both owl species throughout North America, three more haplotypes that appeared to be isolated to the barred owl’s historic range, and a fifth haplotype that was only found in California. Based on infection status and parasite diversity in eastern and western barred owl populations, we found strong support for the Enemy Release Hypothesis. Northern spotted owls had higher parasite diversity and probability of infection than sympatric barred owls, offering some support for the Parasite Spillback and Dilution Effect Hypotheses. Overall, this study demonstrates the complexity of host-parasite relationships and highlights some of the ways in which species’ range expansions may alter such relationships among both invasive and native hosts.
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Acknowledgments
We thank Peter Carlson and Jeremy Rockweit of Klamath Biological Research Station; Mark Higley and the Hoopa Valley Tribe; Green Diamond Resource Company; Robert Feamster and Sierra Pacific Industries; and Laurie Clark and the National Council for Air and Stream Improvement, Inc., for allowing us to conduct research on their lands and for assistance in collecting western owl samples. The Avian Conservation Center (South Carolina), Wildcare Foundation (Oklahoma), Avian Haven (Maine), Carolina Raptor Center (North Carolina), Audubon of Florida (Florida), The Raptor Center (Minnesota), Tri-State Bird Rescue & Research (Delaware), and Alabama Raptor Center (Alabama) collected all the eastern barred owl samples analyzed in this study. Additional field and laboratory assistance came from Constanza Toro, Annie Kellner, Matthew Hopken, Nikki Crider, and Jeremy Dertien. Dr. Thomas Gidlewski provided access to his microscope; Nic Berrong assisted in installing and navigating the i-Solution Lite software; and Drs. Ellen Martinsen and Robert Ricklefs provided positive control samples. Finally, Drs. Liba Pejchar, Brian Foy, Ken Burnham, and Ann Hess assisted in study design and analysis and 2 anonymous reviewers provided helpful comments and suggestions that greatly improved our manuscript. This work was conducted under the auspices of the Colorado State University Institutional Animal Care and Use Committee protocol #10-1818A. Funding and additional support for this project was provided by the U.S.D.A. Forest Service Region 5 contract 11-CS-11052007-319 and Colorado State University.
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Lewicki, K.E., Huyvaert, K.P., Piaggio, A.J. et al. Effects of barred owl (Strix varia) range expansion on Haemoproteus parasite assemblage dynamics and transmission in barred and northern spotted owls (Strix occidentalis caurina). Biol Invasions 17, 1713–1727 (2015). https://doi.org/10.1007/s10530-014-0828-5
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DOI: https://doi.org/10.1007/s10530-014-0828-5